add socks proxy

See PR #33

Fixed #49

• add default language pair when there is no configuration.
• enhance translation quality see this.

• fixed #26
• fixed some bugs

• language auto detect supported. see the alfred-language-configuration，#36
• change the environment keyword: read -> voice.

Fixed: Some languages translate error, eg: Spanish

• add translate history support
• add voice strategy, see environment variable
• pretty code

• 修复长文本翻译结果显示不全的问题
• 修复长文本无法获取发音的问题

为了使workflow操作更简洁，以及为了兼容长文本发音，取消了cmd操作

• 修改复制hotkey，enter -> cmd+C
• 修改发音hotkey，先按住cmd再按enter -> 直接按enter